add binary comparison operators (<, >, etc.) in mathEvaluator

The summmary says it all: we should add support for <, >, <=, >= in the Numeric/mathEvaluator (via MathEx I guess).

• having tests would be nice (e.g in the form a?b:c)

mentioned in issue #156 (closed)

mentioned in issue #258 (closed)

mentioned in issue #259 (closed)

mentioned in issue #282 (closed)

mentioned in issue #289 (closed)

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removed assignee

closed via commit df3009a9

mentioned in commit df3009a9

mentioned in commit 0514cc64

mentioned in issue #597 (closed)

mentioned in issue #687 (closed)

mentioned in issue #804 (closed)

mentioned in issue #955 (closed)

mentioned in issue #1257 (closed)

mentioned in issue #1662 (closed)

mentioned in issue #1860

mentioned in issue #1949 (closed)